This page assumes your wheelchair or scooter has two large 12v batteries on board as most do.

You may as well take advantage of that power!

Why you would want to fit a single heavy duty 24v "Anderson" style connector:

a) Almost all Deep Cycle AGM batteries (and many GEL batteries) as used on our powerchairs and scooters are quite capable of being safely charged much faster with larger (bigger amp) chargers that they are normally supplied with. But the standard powerchair / scooter charge plug/socket and wiring is too small to safely allow this. See Fast Charging Your Powerchair This allows a mid day top up in under an hour and PROLONGS battery longevity to help your pocket and means you go out in the evening fully charged!

b) Various other devices we want to use/run while sat in a powerchair or scooter are mains powered. A larger 24v inverter to 240v ac or 110/120v ac (1000 watts or above up to say 1500 watts) can be safely run from these 50 amp connectors to allow this if correctly fitted.

Or even just a small few hundred watt one. (Although up to a 300 watt inverter can also usually run from your normal existing Neutrix charge socket)

This allows things like mains powered vacuum cleaners, garden tools like electric trimmers or mowers, drills, lights, laptops, hair dryers, car vacuums and polishers, soldering irons, phone chargers, or any other mains powered device you normally need to use an extension lead for, to run directly from your powerchair indoors or out.

Why you would want to add two 12v connectors - one to each battery individually.
FOR ADVANCED users only!

a) It allows you to check that each battery is at the SAME exact voltage after charging and that no imbalance is developing. See the extensive other battery info on this site to understand why this is essential!

b) It allows you to charge each individual battery individually with a 12v charger (ONE AT A TIME ONLY) therefore making sure that both batteries are correctly and absolutely equally charged and at the same exact charged voltage level. Since the two batteries are also connected in series to power your scooter or powerchair then NEVER try to charge both at once as your charger will be damaged or shorted out!

c) It allows you to charge your batteries INDIVIDUALLY very fast when out and about from any 12V automobile. Just use one 12V plug/connector at a time for half an hour and connect to any normal cars 12v charging system (the vehicles battery) with the engine running.

You just need the matching Anderson plug with a couple of crocodile / battery clamps to connect to the vehicles battery as used on a vehicle jump leads. You get a constant 14.4 volts this way from the cars alternator and your battery is safe from overcharge just like your cars own battery is. It will charge very fast. (Typically half hour to 90 percent full from very discharged)

Do only ONE AT A TIME to avoid much smoke and sparks...  You need to understand why this is important... If you don't then don't do it!

You will also need some of these!

I get my terminals and my Anderson connectors from the great Bay of E...

Cheaper crimp versions work, but are less reliable than the soldered ones in the top picture.

I also have Anderson fly leads connected to all my vehicle batteries, and all my chargers.

 In this way its easy to start my van from my powerchair in an emergency or charge my powerchair from my van... Or to connect any of my chargers, inverters, generators, or other appliances together at will just by keeping a single Anderson "extension" lead of a couple of meters length in my van.

As for cable 6 square mm is the minimum size that's is safe. 8 square mm is better. Make sure you do a safe job.  If in any doubt either don't do it or get an expert to do it for you